Add range control to plot

[benjeffery]

Closes #198

I've spent too much time trying to get bidirectional binding working here without any luck. So for now the scrolling on the plot doesn't update the control. Annoyingly I can get it to work in a toy example:

import panel as pn
import holoviews as hv
import hvplot.pandas
import numpy as np
import pandas as pd

pn.extension()
hv.extension('bokeh')

x = np.linspace(0, 100, 1000)
y = np.sin(x/10) + np.random.randn(len(x))*0.1
df = pd.DataFrame({'x': x, 'y': y})

x_range = pn.widgets.TextInput(value='0:100', name='X Range (start:stop)')

def parse_range(range_str):
    try:
        start, end = map(float, range_str.split(':'))
        return (start, end)
    except (ValueError, TypeError):
        return (0, 100)  # Default range if parsing fails

def get_plot(range_str):
    x_range = parse_range(range_str)
    return df.hvplot.line(x='x', y='y').opts(xlim=x_range, framewise=True)

dmap = hv.DynamicMap(pn.bind(get_plot, x_range))

range_stream = hv.streams.RangeX(source=dmap)

def update_widget(event):
    if event.new is not None:
        new_start, new_end = event.new
        new_value = f"{new_start}:{new_end}"
        if new_value != x_range.value:
            x_range.value = new_value

range_stream.param.watch(update_widget, 'x_range')

pn.Column(x_range, dmap).servable()

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[coveralls]

Pull Request Test Coverage Report for Build 11837220564

Details

• 29 of 34 (85.29%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 89.035%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tsbrowse/plot_helpers.py	7	8	87.5%
tsbrowse/pages/edges.py	11	13	84.62%
tsbrowse/pages/mutations.py	11	13	84.62%

Totals
Change from base Build 11837217838:	-0.2%
Covered Lines:	812
Relevant Lines:	912

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💛 - Coveralls